Supplement, dated April 7, 2006, to the
                         Prospectus, dated May 2, 2005,
                                       of
       Seligman Investment Grade Fixed Income Portfolio (the "Portfolio"),
              a portfolio of Seligman Portfolios, Inc. (the "Fund")

Capitalized  terms  used  but not  defined  in this  Supplement  shall  have the
meanings given to such terms in the Portfolio's Prospectus.

The following  information  supersedes  and replaces the  information  contained
under the caption "Seligman  Investment Grade Fixed Income Portfolio - Portfolio
Management" on page 27 of the Prospectus:

The Portfolio is managed by Seligman's  Investment  Grade Team.  The  Investment
Grade Team is headed by Mr.  Francis L.  Mustaro.  Mr.  Mustaro,  a Senior  Vice
President,   Investment  Officer  of  Seligman,  is  Portfolio  Manager  of  the
Portfolio. In addition to his responsibilities in respect of the Portfolio,  Mr.
Mustaro is Portfolio  Manager of Seligman Cash Management Fund,  Inc.,  Seligman
Investment Grade Fixed Income Fund, Inc.,  Seligman U.S.  Government  Securities
Fund (a series of Seligman High Income Fund Series) and Seligman Cash Management
Portfolio (a portfolio of the Fund). He is also Co-Portfolio Manager of Seligman
Income and Growth Fund, Inc. Mr. Mustaro joined Seligman in April 2006. Prior to
joining Seligman,  Mr. Mustaro was a Senior Portfolio Manager, Core Fixed Income
Group of Citigroup Asset Management  ("CAM") since 1995, a Managing  Director of
CAM since 2004 and, prior thereto, a Director of CAM since 2000.

The Fund's Statement of Additional  Information provides additional  information
about the compensation of the Portfolio  Manager,  other accounts managed by the
Portfolio Manager,  and the Portfolio  Manager's  ownership of securities of the
Portfolio.



                     Supplement, dated April 7, 2006, to the
             Statement of Additional Information, dated May 2, 2005,
                   for Seligman Portfolios, Inc. (the "Fund"),
                                on behalf of its
                Seligman Investment Grade Fixed Income Portfolio


Capitalized  terms  used  but not  defined  in this  Supplement  shall  have the
meanings given to such terms in the Fund's Statement of Additional  Information,
dated May 2, 2005 (the "SAI").

The sixth  biography  contained  under  the  caption  "Management  of the Fund -
INTERESTED  DIRECTORS AND PRINCIPAL  OFFICERS" on page 16 of the SAI relating to
Mr. Mahony is hereby deleted in its entirety.

The following  information  supersedes  and replaces the  information  contained
under the caption  "Portfolio  Managers -- Other  Accounts  Managed By Portfolio
Managers,  and Compensation -- Seligman Investment Grade Fixed Income Portfolio"
on page 39 of the SAI:

Table A



-------------------------------------------------------------------------------------------------------------
                               Registered Investment     Other Pooled Investment
     Portfolio Manager               Companies                  Vehicles                Other Accounts
-------------------------------------------------------------------------------------------------------------

-------------------------------------------------------------------------------------------------------------
                                                                          
Francis L. Mustaro*          5 Registered Investment      1 Pooled Investment      35 Other Accounts with
                                  Companies with              Vehicle with           approximately $435.3
                               approximately $368.8        approximately $3.9       million in total assets
                              million in total assets    million in total assets             under
                                 under management.          under management.             management.
-------------------------------------------------------------------------------------------------------------


*As of March 31, 2006.

Compensation:

For 2006, as compensation for his  responsibilities,  Mr. Mustaro is entitled to
receive a base  salary  and fixed  bonus and may also be  entitled  to receive a
discretionary bonus.

Such  discretionary  bonus is subjective and based on numerous  qualitative  and
quantitative factors. The factors,  which have no pre-determined  weightings and
may apply differently from person to person may include, among other things, the
portfolio  manager's  relative   investment   performance  versus  one  or  more
competitive  universes or benchmarks;  and Seligman's overall  profitability and
profitability  attributable  to the assets under  management  for the  portfolio
manager's investment team.

The structure of a portfolio manager's compensation may be modified from time to
time  to  reflect,  among  other  things,  changes  in  responsibilities  or the
competitive environment.